system-hp pavilion a705w when monitor is powerd on after 3 seconds it clicks and the green light becomes yellow. i dont hear any beeps except for one small one at the very beg. of boot up. everything is stock, except a compatible 1GB RAM card i installed just one day before this started occuring. After the ram install, the comp was working good. but now this. these is no video card. should i buy a new power supply or a video card? thank you for your help. ive also tried unplugging everything for 15 min. and trying again to no avail. and i also know that the monitor is not the problem. thanx again.